ProgramNode(0...10)(
  [],
  StatementsNode(0...10)(
    [CallOperatorOrWriteNode(0...10)(
       CallNode(0...4)(
         CallNode(0...1)(nil, nil, (0...1), nil, nil, nil, nil, 0, "a"),
         (1...3),
         (3...4),
         nil,
         nil,
         nil,
         nil,
         1,
         "b="
       ),
       CallNode(9...10)(nil, nil, (9...10), nil, nil, nil, nil, 0, "x"),
       (5...8)
     )]
  )
)
